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mm/page_idle: constify 'struct bin_attribute'

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The sysfs core now allows instances of 'struct bin_attribute' to be moved
into read-only memory.  Make use of that to protect them against
accidental or malicious modifications.

Link: https://lkml.kernel.org/r/20241216-sysfs-const-bin_attr-page_idle-v1-1-cc01ecc55196@weissschuh.net
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Thomas Weißschuh 2024-12-16 13:20:25 +01:00 committed by Andrew Morton
parent 1fc1065355
commit e2c9e6190d
1 changed files with 5 additions and 5 deletions
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10
mm/page_idle.c
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@ -112,7 +112,7 @@ static void page_idle_clear_pte_refs(struct folio *folio)
} }
static ssize_t page_idle_bitmap_read(struct file *file, struct kobject *kobj, static ssize_t page_idle_bitmap_read(struct file *file, struct kobject *kobj,
struct bin_attribute *attr, char *buf, const struct bin_attribute *attr, char *buf,
loff_t pos, size_t count) loff_t pos, size_t count)
{ {
u64 *out = (u64 *)buf; u64 *out = (u64 *)buf;
@ -157,7 +157,7 @@ static ssize_t page_idle_bitmap_read(struct file *file, struct kobject *kobj,
} }
static ssize_t page_idle_bitmap_write(struct file *file, struct kobject *kobj, static ssize_t page_idle_bitmap_write(struct file *file, struct kobject *kobj,
struct bin_attribute *attr, char *buf, const struct bin_attribute *attr, char *buf,
loff_t pos, size_t count) loff_t pos, size_t count)
{ {
const u64 *in = (u64 *)buf; const u64 *in = (u64 *)buf;
@ -193,17 +193,17 @@ static ssize_t page_idle_bitmap_write(struct file *file, struct kobject *kobj,
return (char *)in - buf; return (char *)in - buf;
} }
static struct bin_attribute page_idle_bitmap_attr = static const struct bin_attribute page_idle_bitmap_attr =
__BIN_ATTR(bitmap, 0600, __BIN_ATTR(bitmap, 0600,
page_idle_bitmap_read, page_idle_bitmap_write, 0); page_idle_bitmap_read, page_idle_bitmap_write, 0);
static struct bin_attribute *page_idle_bin_attrs[] = { static const struct bin_attribute *const page_idle_bin_attrs[] = {
&page_idle_bitmap_attr, &page_idle_bitmap_attr,
NULL, NULL,
}; };
static const struct attribute_group page_idle_attr_group = { static const struct attribute_group page_idle_attr_group = {
.bin_attrs = page_idle_bin_attrs, .bin_attrs_new = page_idle_bin_attrs,
.name = "page_idle", .name = "page_idle",
}; };